Whetter's books include The History of Glasney College (Padstow: Tabb House, 1988), Cornwall in the Seventeenth Century (Padstow: Lodenek Press, 1974) and The History of Falmouth (Redruth: Dyllansow Truran, 1981).
Whetter gained a PhD from London University and was director of the Roseland Institute, a centre for Cornish Studies at Gorran Haven near St Austell.
[1] The institute contains a library of over 20,000 books in the process of being catalogued and put on-line and is the base for the publishing activities of Lyfrow Trelyspen and CNP Publications.
[2] In 1974, Whetter stood twice as the Mebyon Kernow parliamentary candidate before founding, in 1975, the Cornish Nationalist Party, a political party that split from Mebyon Kernow to campaign for Cornish independence, and for which he was a candidate at the 1979 general election.
UK Parliament elections Dr Whetter also contested the Cornwall and Plymouth European Parliamentary seat in 1984 as the CNP candidate polling 1,892 votes (1.0).